Shadows of small objects in Eevee
I use a combination of factors if I'm looking for &quot;clean&quot; shadows in eevee.
The first step is to ensure &quot;Contact Shadows&quot; are enabled for all lights that are casting shadows.

The next thing is to Enable &quot;Ambient Occlusion&quot; in the Render Properties settings, and as well, disable, &quot;Soft Shadows&quot;, and enable &quot;High Bitdepth&quot;. The removal of soft shadows may cause some jagged edges on your shadows - to mitigate this, you can increase the shadow cube size.